- news, features, articles and disease information for the swine industry

ThePigSite Quick Disease Guide

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Penis Bleeding

This is a relatively common condition, the boar at mating passes fresh blood into the vagina.


  • Blood around vulva post service.
  • Blood in semen.
  • Blood around the prepuce and skin.
  • No generalised illness.
  • Sudden onset.
  • Haemorrhage only occurs at mating.
Sows, Piglets, Weaners & Growers
  • N/A

Causes / contributing factors

  • Damaged penis.
  • Ulceration of the urethra.
  • Haemorrhage from accessory glands.
  • Haemorrhage from the preputial sac.
  • Trauma to the penis from sows or boars in outdoor mating.


This is made from the clinical symptoms.


  • Rest the boar for 3 weeks
  • Treat with a broad spectrum antibiotic for 5 days
  • If it reoccurs cull the boar

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